Am I running a Wayland compositor?

Following the instructions here, https://docs.waydro.id/usage/install-on-desktops for Ubuntu, I typed:

sudo apt install curl ca-certificates -y
curl -s https://repo.waydro.id  | sudo bash
sudo apt install waydroid -y

Then I found Waydroid in the menu and opened it. It offered "download" with default "vanilla". I clicked "download". I got an error message related to the vendor checksum. I clicked "download" again. It finished. Now, no more Waydroid in the menu. I tried the manual start (using 2 terminal windows):

sudo waydroid container start
waydroid session start

The second command always asks:

Wayland socket '/run/user/1000/wayland-0' doesn't exist; are you running a Wayland compositor?

The first command seems inconsistent:

sudo waydroid container start
   ERROR: WayDroid container service is already running
sudo waydroid container restart
   WayDroid container is STOPPED
sudo waydroid container start
   ERROR: WayDroid container service is already running
sudo waydroid container stop
sudo waydroid container start
   ERROR: WayDroid container service is already running
sudo waydroid container stop
sudo waydroid container stop
sudo waydroid container stop
sudo waydroid container stop
sudo waydroid container start
   ERROR: WayDroid container service is already running

I wondered whether I was running multiple instances, which is why I did stop several consecutive times.